Name
Period
Answer Key
1
Score
2
3
4
February 17, 2014
/54
Grade
%
Directions: Follow the links found in each of the activities listed below to complete the activities.
Activity 1: Visible Light Go to Virtual Prism http://www.sciencejoywagon.com/explrsci/media/prism.htm
1. Click on the button, “hold down for white light”. Describe what happens.
The white light is broken down into separate beams of visible light.
2. Click on hand, move back and forth. (Note that a prism separates light into various wavelengths) 2. Identify the
wavelength of the following colors:
A.
blue light
420 nm
B. yellow light
622 nm
C. red light
668 nm
Activity 2: What Are Electromagnetic Waves? http://www.colorado.edu/physics/2000/waves_particles/index.html
3. What kinds of waves have wavelengths of:
A. about 1-200 meters
radio waves
B. about 1 X10-9 meters
Ultraviolet waves
4. What are the wavelengths of:
A. Microwaves 0.10 meters
B. Visible light 0.5x10-6 meters
C. Gamma rays 10-12 meters
Activity 3: The Electromagnetic Spectrum http://lectureonline.cl.msu.edu/~mmp/applist/Spectrum/s.htm In this applet,
you can click on the wavelength/frequency scale and change the wavelength and frequency by dragging the mouse
around. You can also change the wavelength by using the arrow keys on your keyboard. Holding the shiftkey down while
pressing the left or right arrow keys changes the wavelength by a factor of 10.
5. Add arrows to the picture below showing increasing or decreasing: - Wavelength - Frequency - Total Energy
Wavelength increases
Frequency increases
Total energy increases
Score
/10
Name
Period
6. What is the relationship between
wavelength and frequency?
Answer Key
1
2
3
Score
4
February 17, 2014
/54
Grade
%
The greater the frequency, the smaller the wavelength (they are opposite each other)
7. What type of waves have a wavelength of about a mile?
Radio waves
8. What type of electromagnetic radiation would be considered “safe” to be around, absorb?
9. Which color has: the highest frequency?
Violet
lowest frequency?
Visible light
Red
Activity 4: What is Spectroscopy http://coolcosmos.ipac.caltech.edu/cosmic_classroom/ir_tutorial/spec.html
10. What is the difference between emission spectra and absorption spectra?
Emission spectra occurs when an
electron drops down to a lower orbit and looses energy; absorption spectra occurs when an electron rises to a higher
orbit and absorbs energy.
11. Look at the emission spectrum for the sun and the emission spectrum of hydrogen-20. What do you notice about
the two?
The emission spectrum for the sun is much longer and has more lines than that of hydrogen-20.
12. Label the 7 colors of the rainbow on the light spectrum below from looking at the webpage.
13. When astronomers find new planets
Red
outside our solar system they can
sometimes tell if there is an atmosphere
Orange
Yellow
and the composition of the atmosphere.
How do you think the astronomers can do
this? Use this link for help:
Green
http://www.colorado.edu/physics/2000/
quantumzone/index.html
Blue
Indigo
Each type of gas found in an atmosphere
will give off a different emission spectrum.
Therefore, by examining these spectrums,
Violet
astronomers can see what types of gases
are found in each atmosphere.
14. From your answers to the questions
above, name the relationship between wavelength and frequency in waves that travel at the same velocity like the
waves measured in these activities.
Wavelength will determine the frequency of the wave. Those with a longer
wavelength will have a lower frequency; those with a shorter wavelength will have a higher frequency.
Score
/16
Name
Period
How is it Generated
1
Score
15. Complete the table below.
Type of
Radiation
Answer Key
Frequency
Wavelength
<3x109 Hz
1 meter or
bigger
2
3
4
/54
February 17, 2014
Grade
%
Uses
Radio Waves
Radio waves are also
emitted by stars and gases
in space.
Microwaves
Galaxies
3x109 –
3x1012
0.01 – 1
Infrared
Waves
Solar radiation
3x1012 –
4.3x1014
0.00001 (or
10-6) – 0.01
Light (visible)
Waves
Solar radiation
4.3x1014 –
7.5x1014
8x10-7 –
4x10-8
Colors
Lighting
Ultraviolet
Waves
Solar radiation
7.5x1014 –
3x1017
3x10-7 – 10-8
UV light
X-Rays
Gases in the Universe
3x1017 –
3x1019
10-8 – 10-12
Gamma Rays
The Universe
>3x1019
10-12 and
smaller
AM radio
Amateur radio
Aircraft communication
Microwave ovens
TV remote control
Night vision goggles
Airport security scanners
Medical x-rays
PET scan
Terrestrial gamma-ray flashes
Score
/28